When working on network drives with Mac OS X every Mac user will by default create .DS_Store files. Those files are used by OS X to store custom attributes like icon positions. For more info on .DS_Store files read this article.
To prevent those files from being created:
- Open up the Terminal
- Run the following command
defaults write com.apple.desktopservices DSDontWriteNetworkStores true
- Restart your Mac or log out and back in.
Those .DS_Store files will now only be created on local volumes any you no longer have Windows users yelling at you about them. ;)